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When I installed it (SSO) in my wife's 04 Impreza RS, I noticed right away that the engine ran smoother, quieter, and even the temp gauge is a little lower vs the TSO that was in it. Now in the 06 WRX, the SSO has seemed to quiet down the engine noise and feels a tab bit smoother, however, the temp gauge is unchanged, which I didn't think it would make that much of a difference in temp because of it being a turbo charged engine. I must say that I am impressed with the SSO compared to the TSO.

On a side note I did an oil change on my 95 Dakota (180,885 miles) with Shell's Rotella 5w40 just because it was cheaper than Amsoil's 10w30 and I was at Wally World any so I thought I would give it a try. What is surprising is that the oil pressure guage was not as high as it was with Amsoil's 10w30, however, the truck is running quiter....The truck is only driven on about 1,000 mi/year now. The next oil change will be with Amsoil's DEO 5w40 just to compare.

I've had a similar experience. I have switched a few cars over to Amsoil and they have all smoothed out a little. However, once I've switched I have always used the exact same product and weight as long as I've had the car. I had a 97 Dakota that I ran M1 until about 65000 miles and it was burning about 2 quarts every 3k miles. The truck was only driven every few weeks. When I switched to Amsoil 10W-30 the burning slowed down, but it still ate oil when I got rid of it at 100,000 miles.

Also, both my 2002 2.5RS and my 2005 WRX have given me a death knock at start-up at some point in their lifetime, but I have never had any problems with either. A UOA on the WRX shows 0 wear metals at 120k miles and I have been using Amsoil ASL 5W-30 since 10k miles. I have absolutely nothing to back-up my claim, but I think that the break-in period of an engine is very important, as is proper oil warm-up before high RPM driving. Then, drive like you stole it.

That'd be just fine, except you put Amsoil in it! How could you make such a terrible decision?! Your engine'll implode within a dozen miles, if it even makes it that far!!

Wiseguy.

Quote:

Originally Posted by 06grayrex

What was the deciding factor that made you go with the SSO? Report back after the oil change..

I switched from GC to conventional 5W30 for an Auto-RX clean and rinse and I think my turbo spools just a bit quicker and my gas mileage is a little better. Maybe the quicker spool is all in my head. Plus every thread about SSO on bitog has you raving about it and your experience with TSO. I'm usually in SC in late July for 1-2 weeks (100F) and GC is a bit noisy and that's one reason I was considering a thicker oil. The current price of gas was also a factor!

Seeing good Amsoil results here and on bitog is getting the thin fear factor out of my head as well. I think it's more of a base oil and additive thing for the best protection than viscosity alone (e.g. Bruceblends ). Although, I still wouldn't be comfortable running a GF-4 oil since I prefer to go at least 7,500 miles during an OCI.